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Razak NA, Fagge II, Elhefian EA, Khan MN. Kinetics and Mechanism of Flexible Nanoparticles-Catalyzed Piperidinolysis of Anionic Phenyl Salicylate: Flexible Nanoparticles: CTABr/M2X/H2O (M2X = 4-MeOSaNa2, 3-, 4-MeSaNa2). RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2019. [DOI: 10.1134/s1990793119010111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ahmad WHW, Fagge II, Sim YL, Khan MN. Kinetics and Mechanism of Alkaline Hydrolysis of N-(o-Aminophenyl)Phthalimide in the Presence and Absence of Cationic Micelles and Sodium Salts of Aliphatic Acids. PROGRESS IN REACTION KINETICS AND MECHANISM 2018. [DOI: 10.3184/146867818x15161889114510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Pseudo first-order rate constants, k obs, for the alkaline hydrolysis of N-( o-aminophenyl) phthalimide, obtained at constant [CTABr]T (total concentration of cetyltrimethylammonium bromide) and varying concentrations of inert salt MX (MX = sodium formate, sodium acetate, sodium propanoate, sodium butyrate, sodium valerate and sodium hexanoate) follow the relationship: [Formula: see text], where θ and KX/S are empirical constants and S = HO-. The values of KX/S for each aliphatic acid decrease with an increase in [CTABr]T. This relationship gives an empirical constant whose magnitude is the measure of the ability of an ion, X-, to expel another counterion S-, from the cationic micellar surface to the bulk aqueous phase. The values of the empirical constant, KX/S, are used to derive the ion exchange constant, KBrX.
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Affiliation(s)
- Wan Hamdah Wan Ahmad
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ibrahim I. Fagge
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Department of Chemistry, Faculty of Science, Kano University of Science and Technology, Wudil, Nigeria
| | - Yoke-Leng Sim
- Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia
| | - M. Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Khan MN, Fagge II. Kinetics and Mechanism of Cationic Micelle/Flexible Nanoparticle Catalysis: A Review. PROGRESS IN REACTION KINETICS AND MECHANISM 2018. [DOI: 10.3184/146867818x15066862094905] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aqueous surfactant (Surf) solution at [Surf] > cmc (critical micelle concentration) contains flexible micelles/nanoparticles. These particles form a pseudophase of different shapes and sizes where the medium polarity decreases as the distance increases from the exterior region of the interface of the Surf/H2O particle towards its furthest interior region. Flexible nanoparticles (FNs) catalyse a variety of chemical and biochemical reactions. FN catalysis involves both positive catalysis ( i.e. rate increase) and negative catalysis ( i.e. rate decrease). This article describes the mechanistic details of these catalyses at the molecular level, which reveals the molecular origin of these catalyses. Effects of inert counterionic salts (MX) on the rates of bimolecular reactions (with one of the reactants as reactive counterion) in the presence of ionic FNs/micelles may result in either positive or negative catalysis. The kinetics of cationic FN (Surf/MX/H2O)-catalysed bimolecular reactions (with nonionic and anionic reactants) provide kinetic parameters which can be used to determine an ion exchange constant or the ratio of the binding constants of counterions.
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Affiliation(s)
- Mohammad Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Ibrahim Isah Fagge
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Department of Chemistry, Faculty of Science, Kano University of Science and Technology, Wudil, Nigeria
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Fagge II, Ahmad WHW, Md Zain S, Khan MN. Kinetics and Mechanism of Counterionic Salt-Catalysed Piperidinolysis of Anionic Phenyl Salicylate in the Presence of Cationic–Nonionic Mixed Micelles. PROGRESS IN REACTION KINETICS AND MECHANISM 2018. [DOI: 10.3184/146867818x15066862094888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The quantitative correlation of counterion-affinity to aqueous hexadecyltrimethylammonium bromide (HDAB, cationic micelles/nanoparticles) and the counterion-induced HDAB micellar growth, in the presence of different amounts of poly(ethylene glycol hexadecyl ether) (C16E20, nonionic surfactant), was achieved by the use of a semi-empirical kinetic (SEK) method. The values of the ratio of cationic HDAB, as well as mixed HDAB–C16E20, micellar binding constants of X and Br, KX/ KBr (= KXBr or RXBr) for X = 4-ClC6H4CO2-, were obtained by the SEK method. The concentration range (0.006–0.015 M) of pure HDAB was found to have no influence on the values of KXBr or RXBr. These observations were also recorded upon addition of a nonionic surfactant, C16E20, in an aqueous solution of HDAB. The mean value of KXBr or RXBr obtained in the presence of pure HDAB ( KXBr or RXBr = 50.3) is 2.3 times larger than that in the presence of mixed HDAB–C16E20 (m KXBr or m RXBr = 21.7). From rheometric measurements of aqueous HDA+/4-ClC6H4CO2- with 0.015 M HDAB, single symmetric maxima (at both 25 and 35 °C) were obtained at [4-ClC6H4CO2Na] = 0.03 M. This is evidence for the existence of wormlike micelles/nanoparticles. However, the absence of a maximum in rheometric data for aqueous HDA+/C16E20/4-ClC6H4CO2- with 0.015 M HDAB and 0.006 M C16E20 at various [4-ClC6H4CO2Na] revealed the existence of spherical micelles.
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Affiliation(s)
- Ibrahim I. Fagge
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
- Department of Chemistry, Faculty of Science, Kano University of Science and Technology, Wudil, Nigeria
| | - W. Hamdah W. Ahmad
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Sharifuddin Md Zain
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - M. Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Fagge II, Khalid K, Noh MAM, Yusof NSM, Zain SM, Khan MN. Study of Cationic and Nonionic Mixed Micelles with NaBr and 3,5-Cl 2C 6H 3CO 2Na by Use of Probe Nucleophilic Reaction of Piperidine with Ionized Phenyl Salicylate. J Oleo Sci 2018; 67:55-66. [PMID: 29238023 DOI: 10.5650/jos.ess17033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Behaviors of cationic and nonionic mixed micelles in the form of hexadecyltrimethylammonium bromide (HDABr) and hexadecyltrimethylammonium bromide-Polyethylene glycol hexadecyl ether (C16E20), in the presence of inert salts (NaBr and 3,5-dichlorosodium benzoate), by the use of reaction probe between Pp and ionized PhSH (Pp = piperidine and PhSH = phenyl salicylate), has been reported in this work. The values of RXBr (RXBr denotes ion exchange constants obtained in the presence of micelles of different structural features) or KXBr (KXBr denotes ion exchange constants obtained in the presence of micelles of the same structural features) for 3,5-Cl2C6H3CO2- were almost the same at three different [HDABr]T (0.006, 0.010 and 0.015 M). The average value of RXBr or KXBr determined, in the presence of pure HDABr micelles, using semi empirical kinetic (SEK) method appeared to be almost 2½-fold larger (RXBr or KXBr = 198) than that in the presence of mixed HDABr-C16E20 micelles (RXBr or KXBr = 78). Rheological measurements indicated the existence of wormlike/twisted micelles and vesicle at 0.015 M pure HDABr, various [3,5-Cl2C6H3CO2Na], and 25 and 35℃ whereas there were evidence of only spherical micelles in the presence of mixed HDABr-C16E20 ([HDABr]T = 0.015 M and [C16E20]T = 0.006 M) at both temperatures.
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Affiliation(s)
- Ibrahim Isah Fagge
- Department of Chemistry, Faculty of Science, University of Malaya.,Department of Chemistry, Faculty of Science, Kano University of Science and Technology
| | - Khalisanni Khalid
- Department of Chemistry, Faculty of Science, University of Malaya.,Agri-Nanotechnology Program (BT4), Biotechnology and Nanotechnology Research Centre (BT), Malaysian Agricultural Research and Development Institute (MARDI)
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Khalid K, Zain SM, Khan MN. Catalytic effects of cationic nanoparticle (CTABr/NaX/H2O, X = Cl, Br) for the piperidinolysis of phenyl salicylate ions. KINETICS AND CATALYSIS 2017. [DOI: 10.1134/s0023158417050111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Counterion-Induced Cationic Flexible Nanoparticle Catalytic of Piperidinolysis of Phenyl Salicylate. J SURFACTANTS DETERG 2017. [DOI: 10.1007/s11743-017-1975-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Khalid K, Noh MAM, Khan MN, Ishak R, Penney E, Chowdhury ZZ, Hamzah MH, Othman M. Giant vesicles (GV) in colloidal system under the optical polarization microscope (OPM). Micron 2017; 100:30-33. [PMID: 28477556 DOI: 10.1016/j.micron.2017.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/16/2017] [Accepted: 04/25/2017] [Indexed: 10/19/2022]
Abstract
This paper discusses the unprecedented microscopic findings of micellar growth in colloidal system (CS) of catalyzed piperidinolysis of ionized phenyl salicylate (PS-). The giant vesicles (GV) was observed under the optical polarization microscope (OPM) at [NaX]=0.1M where X=3-isopropC6H4O-. The conditions were rationalized from pseudo-first-order rate constant, kobs of PS- of micellar phase at 31.1×10-3s-1 reported in previous publication. The overall diameter of GV (57.6μm) in CS (CTABr/NaX/H2O)-catalyzed piperidinolysis (where X=3-isopropC6H4O) of ionized phenyl salicylate were found as giant unilamellar vesicles (GUV) and giant multilamellar vesicles (GMV). The findings were also validated by means of rheological analysis.
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Affiliation(s)
- Khalisanni Khalid
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia (1); Laboratory Management Program, Technical and Commercialization Centre, Malaysian Agricultural Research and Development Institute (MARDI), 43400 Serdang, Selangor, Malaysia.
| | - Muhammad Azri Mohd Noh
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia (1)
| | - M Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia (1)
| | - Ruzaina Ishak
- National Centre for Food Manufacturing, University of Lincoln, Holbeach Technology Park, Park Road, Holbeach, Lincolnshire, PE12 7PT, United Kingdom
| | - Esther Penney
- National Centre for Food Manufacturing, University of Lincoln, Holbeach Technology Park, Park Road, Holbeach, Lincolnshire, PE12 7PT, United Kingdom
| | - Zaira Zaman Chowdhury
- Nanotechnology and Catalysis Research Center (NANOCAT), University Malaya, Kuala Lumpur 50603, Malaysia
| | - Mohammad Hafiz Hamzah
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia (1); National Institute of Public Administration (INTAN) Main Campus Bukit Kiara, Jalan Bukit Kiara, 50480 Kuala Lumpur, Malaysia
| | - Maizatulnisa Othman
- Department of Manufacturing and Material Engineering, Kuliyyah of Engineering, International Islamic University Malaysia, Jalan Gombak, Selangor Darul Ehsan, PO BOX 10, 50728 Kuala Lumpur, Malaysia
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Yusof NSM, Said MNM, Khan MN. Quantitative correlation between counterion (X) binding affinity to cationic micelles and X – Induced micellar growth for substituted iodobenzoates (X). ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.10.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Khalid K, Noh MAM, Zain SM, Khan MN. Determination of Relative Counterion Binding Constant to Cationic Micelles. Top Curr Chem (Cham) 2017; 375:45. [PMID: 28357712 DOI: 10.1007/s41061-017-0132-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 03/17/2017] [Indexed: 11/28/2022]
Abstract
The efficiency of counterion affinity towards ionic micelles is often described in terms of the degree of counterion binding (β X ) to ionic micelles or the conventional ion-exchange constant ([Formula: see text]) or relative binding constant ([Formula: see text]) of X - and Br- counterions. This review describes the use of ionized phenyl salicylate ions, PSa-, as a new probe to determine [Formula: see text] values using a semiempirical spectrophotometric method. The value of [Formula: see text] is found to be comparable to reported values obtained using different probes by the semiempirical kinetic method as well as different physical methods. Application of semiempirical methods for calculation of [Formula: see text] or [Formula: see text] values involves an inherent assumption that these values are independent of the physicochemical characteristics of the probe molecule.
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Affiliation(s)
- Khalisanni Khalid
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia. .,Laboratory Management Program, Laboratory and Technical Service Centre, Malaysian Agricultural Research and Development Institute (MARDI), 43400, Serdang, Selangor, Malaysia.
| | - Muhammad Azri Mohd Noh
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - Sharifuddin Md Zain
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia
| | - M Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
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Correlation of Kinetic and Rheological Data for Flexible Nanoparticle Catalysis in the Reaction of Piperidine with PS−. Catal Letters 2016. [DOI: 10.1007/s10562-016-1715-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Mohd Noh MA, Khalid K, Ariffin A, Khan MN. Kinetics and Mechanism of Cationic Flexible Nanoparticles (CFN) – Catalyzed Piperidinolysis of Anionic Phenyl Salicylate: CFN = TTABr/MX/H<sub>2</sub>O with MX = NaCl, NaBr; C<sub>n</sub>H<sub>2n+1</sub>CO<sub>2</sub>Na, n = 4, 5, 6 and 7. J Oleo Sci 2016; 65:749-58. [DOI: 10.5650/jos.ess16048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | | | - Azhar Ariffin
- Department of Chemistry, Faculty of Science, University of Malaya
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Fagge II, Khalid K, Noh MAM, Yusof NSM, Zain SM, Khan MN. Influence of mixed CTABr–C 16E 20 nanoparticles on relative counterion binding constants in aqueous solutions of inert salts (2-NaOC 6H 4CO 2Na and NaBr): kinetic and rheometric study. RSC Adv 2016. [DOI: 10.1039/c6ra19106a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A semi-empirical kinetic technique has been used to obtain the ratios of pure CTABr (cationic nanoparticle) and mixed CTABr–C16E20 (cationic–nonionic nanoparticle) micellar binding constants of counterions X and Br, KX/KBr (=KBrX or RBrX) for X = salicylate ion.
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Affiliation(s)
- Ibrahim I. Fagge
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Khalisanni Khalid
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - M. Azri M. Noh
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Nor Saadah M. Yusof
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Sharifuddin Md Zain
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - M. Niyaz Khan
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
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van Schrojenstein Lantman EM, de Peinder P, Mank AJG, Weckhuysen BM. Cover Picture: Separation of Time-Resolved Phenomena in Surface-Enhanced Raman Scattering of the Photocatalytic Reduction of p-Nitrothiophenol (ChemPhysChem 3/2015). Chemphyschem 2015. [DOI: 10.1002/cphc.201402775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Basílio N, Spudeit DA, Bastos J, Scorsin L, Fiedler HD, Nome F, García-Río L. Exploring the charged nature of supramolecular micelles based on p-sulfonatocalix[6]arene and dodecyltrimethylammonium bromide. Phys Chem Chem Phys 2015; 17:26378-85. [DOI: 10.1039/c5cp03718b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Kinetic probes were used together with capillary electrophoresis experiments to get insights into the interfacial and solubilizing properties of supramolecular micelles made of an anionic calix[6]arene and a cationic surfactant.
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Affiliation(s)
- Nuno Basílio
- Laboratório Associado para a Química Verde (LAQV)
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
| | | | - Juliana Bastos
- INCT-Catálise
- Departamento de Química
- Universidade Federal de Santa Catarina
- Brazil
| | - Leandro Scorsin
- INCT-Catálise
- Departamento de Química
- Universidade Federal de Santa Catarina
- Brazil
| | - Haidi D. Fiedler
- INCT-Catálise
- Departamento de Química
- Universidade Federal de Santa Catarina
- Brazil
| | - Faruk Nome
- INCT-Catálise
- Departamento de Química
- Universidade Federal de Santa Catarina
- Brazil
| | - Luis García-Río
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
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Razak NA, Khan MN. Kinetics and mechanism of nanoparticles-catalyzed piperidinolysis of anionic phenyl salicylate. ScientificWorldJournal 2014; 2014:604139. [PMID: 25478597 PMCID: PMC4248332 DOI: 10.1155/2014/604139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 09/09/2014] [Indexed: 11/17/2022] Open
Abstract
The values of the relative counterion (X) binding constant R(X)(Br) (=K(X)/K(Br), where K(X) and K(Br) represent cetyltrimethylammonium bromide, CTABr, micellar binding constants of X(v-) (in non-spherical micelles), v = 1,2, and Br(-) (in spherical micelles)) are 58, 68, 127, and 125 for X(v-) = 1(-), 1(2-), 2(-), and 2(2-), respectively. The values of 15 mM CTABr/[Na(v)X] nanoparticles-catalyzed apparent second-order rate constants for piperidinolysis of ionized phenyl salicylate at 35 °C are 0.417, 0.488, 0.926, and 0.891 M(-1) s(-1) for Na(v)X = Na1, Na2 1, Na2, and Na2 2, respectively. Almost entire catalytic effect of nanoparticles catalyst is due to the ability of nonreactive counterions, X(v-), to expel reactive counterions, 3(-), from nanoparticles to the bulk water phase.
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Affiliation(s)
- Norazizah Abd. Razak
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - M. Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Razak NA, Yusof NSM, Khan MN. Kinetics and mechanism of nanoparticles (CTABr/MX/H2O)-catalyzed piperidinolysis of ionized phenyl salicylate. 1. J Taiwan Inst Chem Eng 2014. [DOI: 10.1016/j.jtice.2014.07.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Khan MN, Yusof NSM, Razak NA. Semi-empirical spectrophotometric (SESp) method for the indirect determination of the ratio of cationic micellar binding constants of counterions X⁻ and Br⁻(K(X)/K(Br)). J Oleo Sci 2013; 62:695-708. [PMID: 24005014 DOI: 10.5650/jos.62.695] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The semi-empirical spectrophotometric (SESp) method, for the indirect determination of ion exchange constants (K(X)(Br)) of ion exchange processes occurring between counterions (X⁻ and Br⁻) at the cationic micellar surface, is described in this article. The method uses an anionic spectrophotometric probe molecule, N-(2-methoxyphenyl)phthalamate ion (1⁻), which measures the effects of varying concentrations of inert inorganic or organic salt (Na(v)X, v = 1, 2) on absorbance, (A(ob)) at 310 nm, of samples containing constant concentrations of 1⁻, NaOH and cationic micelles. The observed data fit satisfactorily to an empirical equation which gives the values of two empirical constants. These empirical constants lead to the determination of K(X)(Br) (= K(X)/K(Br) with K(X) and K(Br) representing cationic micellar binding constants of counterions X and Br⁻). This method gives values of K(X)(Br) for both moderately hydrophobic and hydrophilic X⁻. The values of K(X)(Br), obtained by using this method, are comparable with the corresponding values of K(X)(Br), obtained by the use of semi-empirical kinetic (SEK) method, for different moderately hydrophobic X. The values of K(X)(Br) for X = Cl⁻ and 2,6-Cl₂C6H₃CO₂⁻, obtained by the use of SESp and SEK methods, are similar to those obtained by the use of other different conventional methods.
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Affiliation(s)
- Mohammad Niyaz Khan
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.
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Yusof NSM, Khan MN. Quantitative correlation between counterion-affinity to cationic micelles and counterion-induced micellar growth. Adv Colloid Interface Sci 2013; 193-194:12-23. [PMID: 23582713 DOI: 10.1016/j.cis.2013.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 03/14/2013] [Accepted: 03/16/2013] [Indexed: 11/26/2022]
Abstract
The fascinating and serendipitous discovery, in 1976, of the characteristic viscoelastic behavior of wormlike micelles of cetyltrimethylammonium salicylate (CTASa) surfactant solution at ~2×10(-4) M CTASa became a catalyst for an increasing interest in both industrial application and mechanism of the origin of micellar growth of this and related wormlike micellar systems. It has been perceived for more than three decades, based upon qualitative evidence, that the extent of the strength of the counterion (X) binding to ionic micelles determines the counterion-induced micellar structural transition from spherical-to-small rodlike-to-linear long stiff/flexible rodlike/wormlike-to-entangled wormlike micelles. This perception predicts the presence of a possible quantitative correlation of counterionic micellar binding constants (KX) with counterion-induced micellar growth. The quantitative estimation of counterion binding affinity to cationic micelles, in terms of the values of the degree of counterion binding (βX), is concluded to be either inefficient or unreliable for moderately hydrophobic counterions (such as substituted benzoate ions). The values of KX, measured in terms of conventional ion exchange constants (KX(Y)), can provide a quantitative correlation between KX or KX(Y) (with a reference counterion Y=Cl(-) or Br(-)) and counterion-induced ionic micellar growth. A recent new semi-empirical kinetic (SEK) method provides the estimation of KX(Y) for Y=Br as well as ratio of counterionic micellar binding constants KX/KBr (= RX(Br)) where the values of KBr and KX have been derived from the kinetic parameters in the presence of cationic spherical and nonspherical micelles, respectively. The SEK method has been used to determine the values of KX(Br) or RX(Br) for X=2-, 3- and 4-ClC6H4CO2(-). Rheometric measurements on aqueous CTABr/MX (MX=2-,3- and 4-ClBzNa) solutions containing 0.015 M CTABr and varying values of [MX] reveal the presence of spherical micelles for MX=2-ClBzNa and long linear as well as entangled wormlike micelles for MX=3- and 4-ClBzNa. The respective values of KX(Br) or RX(Br) of 5.7, 50 and 48 for X=2-, 3- and 4-ClBz(-) give a quantitative correlation with the rheometric measurements of the structural features of micelles of 0.015 M CTABr solutions containing 2-, 3- and 4 ClBzNa.
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Weber CC, Masters AF, Maschmeyer T. Pseudoverkapselung - Nanodomänen für verstärkte Reaktivität in ionischen Flüssigkeiten. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Weber CC, Masters AF, Maschmeyer T. Pseudo-Encapsulation-Nanodomains for Enhanced Reactivity in Ionic Liquids. Angew Chem Int Ed Engl 2012; 51:11483-6. [DOI: 10.1002/anie.201206113] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Indexed: 11/09/2022]
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Yusof NSM, Khan MN. Quantitative Correlation of Counterion (X) Affinity to Ionic Micelles and X- and Temperature-Induced Micellar Growth (Spherical – Wormlike Micelles – Vesicles) for X = 5-Methyl- and 5-Methoxysalicylate Ions. J Phys Chem B 2012; 116:2065-74. [PMID: 22272582 DOI: 10.1021/jp210467p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nor Saadah M. Yusof
- Department of Chemistry, Faculty
of Science, University of Malaya, 50603
Kuala Lumpur, Malaysia
| | - M. Niyaz Khan
- Department of Chemistry, Faculty
of Science, University of Malaya, 50603
Kuala Lumpur, Malaysia
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Yusof NSM, Niyaz Khan M. Kinetic and rheological measurements of the effects of inert 2-, 3- and 4-bromobenzoate ions on the cationic micellar-mediated rate of piperidinolysis of ionized phenyl salicylate. J Colloid Interface Sci 2011; 357:121-8. [DOI: 10.1016/j.jcis.2011.01.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 01/18/2011] [Accepted: 01/20/2011] [Indexed: 10/18/2022]
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